Our glow ice cubes come in a variety pack of GREEN , BLUE , RED and YELLOW. Easy to activate by placing the glow cube bottom down on a flat surface and pressing down until you feel a pop. Shake the glow cube to activate the glow and let the fun begin. The glow will last up to 6 hours and will only glow once. Our glow ice cube assortment comes in a retail package and is sold 4 glow cubes to the pack. Please order in increments of 1 pack.